The 5G era finally roared in 2020, and since the second half of 2019, the market has surged into a 5G technology boom, and consumers have seen more and more related products, including the placement of 5G communications environments,5G related applications, and the listing of the more familiar 5Gsoc and 5G phones. For now, the main players that have launched the devices include Huawei, qualcomm, samsung and unifax, and even more are those who have launched the devices. In this article, we first look at the light of domestic goods Huawei Kirin 9905G.
As one of the world's most powerful mobile-chip makers,Huawei brought the 5g soc-kylin 9905g with an integrated 5g base at its september 2019 launch. Shortly after its release, it was sold with a new version of the Mate 30 Pro 5G. Not only that, Kirin 9905G is the world's first mobile chip to support SA\/NSA dual-mode, so the market is highly focused.
Kirin 9905G is the world's first mobile chip with integrated baseband and AP units, and the world's first to integrate 5G basebands. On the product implementation, the baseband and processor parts of Kirin 9905G are integrated on one chip and manufactured using TSMC 7nm process. This approach carries some technical risk, mainly that the baseband module will use some analog circuits, while the processor part will use a large number of digital circuits, which require different processes and processes in manufacturing, which is easier to handle in a mature process, but for Kirin 9905G, which is 7nm and has been manufactured using EUV technology. Fortunately, in real terms, the Huawei and the manufacturer fit well in this section, avoiding the \"minefield\" of the early stages of the new process and achieving a high crystal density.
At present, the complexity of 5G baseband brings about the increase of chip area at the same time. Even with a 7nm process using the latest and some of the EUV processes, Kirin 9905G has a total chip area of more than 100mm2. However, the integrated PCB area is still less than the separated external baseband, and has some advantages in heat control and power consumption.
According to the relevant perspective, although Kirin 9905G is an integrated baseband design, it is possible that two parts of the baseband are still used, with 4G and below in the center of the lower part of the chip,5G in the lower right side of the chip, and 4G in the base band. The claim has yet to be officially confirmed by Huawei, but it also reflects the difficulty of 5G baseband design on one side.
As an integrated baseband product, kylin 9905g is difficult to achieve \"big package complete \", considering the chip specifications and practical use,Huawei also in the baseband support of the specifications have a trade-off. For example, the base band of Kirin 9905G only supports centimeter wave in 5G, that is, Sub-6GHz specification, and does not support millimeter wave mode, so its maximum download speed is, upload speed is. In terms of the mode of 5G network, Kirin 9905G is also the first 5G SOC to support dual-mode SA\/NSA (independent networking\/independent networking).
除了基带部分引发了关注外，麒麟9905G在其他地方的设计也颇为引人注目。在CPU架构方面，华为选择的是经过自己优化改进后的Cortex-A76搭配Cortex-A55，架构采用的是华为之前在麒麟980上就已经使用过的“2 2 4”模式，也就是将处理器核心分为三组，其中两个基于Cortex-A76架构的高性能核心运行频率可达，剩余两个基于Cortex-A76架构的中等性能、高效率核心的运行频率为，4个基于Cortex-A55设计的节能小核心运行最高为。GPU方面，华为选择了ARM的Mali-G76MP16，运行频率为750MHz，这也是有史以来华为采用的规模最大、性能最强的GPU模组。
In addition to the interest in the baseband section, kylin 9905g's designs are striking elsewhere. In terms of CPU architecture,Huawei chooses Cortex-A76 with Cortex-A55 after its own optimization and improvement. The architecture uses the \"22 4\" mode that Huawei has already used on Kirin 980, that is, the processor core is divided into three groups, two of which are based on Cortex-A76 architecture with high performance core running frequency, the remaining two based on Cortex-A76 architecture with medium performance and high efficiency core running frequency, and four based on Cortex-A555 design with energy saving core is the highest. On the GPU side,Huawei chose ARM's Mali-G76MP16 with a running frequency of 750 MHz, which is also the largest and most powerful GPU module ever used by Huawei.
In addition to CPU and GPU, Kirin 9905G's biggest technical highlight is that its AI computing power has been greatly enhanced. Kirin 9905G has adopted a new Leonardo da Vinci architecture on the NPU, the neural processing unit, and Huawei claims that its overall performance is more than six times higher than that of other similar cores in the industry. In addition to its large NPU core,Huawei has internally designed an NPU microcore for applications that require less performance but require AI acceleration to increase the energy consumption ratio of the entire processor.
In order to make better use of NPU,Huawei has also worked hard on software. The new NPU supports more than 300 AI operators, supports 90% open source models, and the software and hardware are double-accelerated, and the overall efficiency is good. The actual test shows that Kirin 9905G, with its powerful AI computing power, can realize the work of real-time stripping and replacing video dynamic picture characters and background, which is difficult to achieve in previous products.
In general, Kirin 9905G as the earliest available 5GSoC, its overall design and trade-offs are more appropriate, although the latest version of the CPU architecture is not used, but the overall performance is still remarkable. In particular, the design of the integrated 5G base band brings a small chip area, and makes the mobile devices that apply it have a relatively generous space to arrange other hardware, which is commendable.